/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.github.dapeng.api.healthcheck;

import java.util.ServiceLoader;

/**
 * @Author: zhup
 * @Date: 2018/8/6 10:59
 */

public class DoctorFactory {

    private static Doctor doctor;

    public static void createDoctor(ClassLoader containerCl) {
        if (doctor == null) {
            synchronized (DoctorFactory.class) {
                if (doctor == null) {
                    ServiceLoader<DoctorFactorySpi> doctorFactorySpis = ServiceLoader.load(DoctorFactorySpi.class, containerCl);
                    assert doctorFactorySpis.iterator().hasNext();
                    doctor = doctorFactorySpis.iterator().next().createInstance();
                }
            }
        }
    }

    public static Doctor getDoctor() {
        return doctor;
    }
}
